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Question

What is the unit of refractive index?


A

metre/second

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B

metre

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C

no unit

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D

Dioptre

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Solution

The correct option is C

no unit


Refractive index(n) =Speed of light in vacuumSpeed of light in the medium

Since the refractive index is a ratio of two similar quantities(speed of light), it has no unit.


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